| 摘要 |
PURPOSE:To shorten a checking time, by providing a pattern memory control signal selection circuit, an expectation value memory circuit and a comparing circuit and checking a pattern memory circuit in a hardware manner. CONSTITUTION:A signal selection circuit 23 is controlled by CPU and the checking data stored in a ROM circuit 22 is supplied to a pattern memory RAM circuit 9. After writing operation is finished, the pattern memory RAM circuit 9 becomes a read state and a strobe signal is generated from a pattern memory control signal selection circuit 20 in synchronous relation to the pulse signal from a pattern memory address control circuit 5. A comparing circuit 24 compares the data written in the pattern memory RAM circuit 9 with read data and stops the pattern running of the pattern memory address control circuit 5 when the data are judged to be non-coincidence. CPU monitors whether a pattern has run to the pattern final address of the circuit to check the pattern memory circuit.
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